Levels did not significantly differ between those mothers who, according to a dietary questionnaire, took vitamin supplements containing B 12 compared to those who did not, although the B 12 supplemental dose was only 3 mcg per day.[45] Four hundred ninety-one pregnancy women in Dar-es-Salaam, Tanzania were randomized to receive a daily multivitamin supplement containing 50 mcg vitamin B 12 or placebo from 20 weeks gestation
They are used for different reasons
IM vitamin injections bypass the gut and 90% or more of the vitamin is absorbed by the body
This way, the vials can remain germ-free for up to 4 weeks and can be used for multiple dosing
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